"It is my understanding that you're are not able to use Airdrop on your Mac unless you open the Finder and click Airdrop."
That is wrong - unless Airdrop changed with either iOS 11 or High Sierra.
I've been using Airdrop for years. It was as simple as choosing a photo on my iPhone and selecting my Mac in Airdrop on my iPhone. The photo would be sent to the downloads folder of my Mac. I didn't have to be sitting at my Mac to do anything. But now, I have to also open Airdrop on my Mac. Imagine if Handoff only worked on the Mac if you clicked a Handoff icon on the Mac.
Also: "Block all incoming connections" doesn't seem to exist anymore in System Preferences > Security & Privacy for High Sierra.
To be clear here, I'm using a late 2014 Mac Mini and an iPhone 6 Plus. I've been able to use Airdrop to send photos from this iPhone to this Mac for the past 3 years without ever having to select an Airdrop icon in the finder sidebar. It used to be as simple as clicking the export icon in Photos on my iPhone, and choosing my Mac when it showed up in Airdrop. Click, done. Now, I have to also go to my Mac, open the finder and choose Airdrop. That's new and it's annoying. Is it some new security feature?